| Professional Site Management Limited | Construction | 2013 |
| Professional Technical Training Limited | Transport & logistics | 2001 |
| Profitability Business Simulations Limited | Professional & scientific | 2002 |
| Profitness & Leisure Ltd | Wholesale & retail | 2018 |
| Proforest Group Limited | Agriculture & fishing | 2022 |
| Proforest Ltd. | Professional & scientific | 1999 |
| Progress Accountants Limited | Professional & scientific | 2019 |
| Progress Through Business Ltd | Education | 2024 |
| Proguide Management Resources Ltd | Professional & scientific | 2025 |
| Project 51 Architecture Ltd | Professional & scientific | 2016 |
| Project and Programme Consultancy Limited | Professional & scientific | 2022 |
| Project August Limited | Professional & scientific | 2022 |
| Project Contracts Solutions Ltd | Information & communication | 2023 |
| Project Design Architects Limited | Professional & scientific | 2009 |
| Project Diaspora CIC | Education | 2025 |
| Project Management Trading Ltd | Construction | 2024 |
| Project Numbers FX Holdco Limited | Financial services | 2025 |
| Project Risk & Information Management Agent Prima Ltd | Professional & scientific | 2019 |
| Project Steak Limited | Hospitality | 2020 |
| Projective Development Ltd | Construction | 2019 |
| Prokana Limited | Construction | 2025 |
| Prome Tech Ltd | Professional & scientific | 2024 |
| Prometheus OIL Ltd | Wholesale & retail | 2022 |
| Prominency Properties Ltd | Real estate | 2026 |
| Pronoia Limited | Information & communication | 1998 |
| Pronto Cocktails Limited | Manufacturing | 2017 |
| Proof Relevant Ltd | Information & communication | 2025 |
| Propaganda Sports Ltd | Manufacturing | 2013 |
| Properties United Limited | Construction | 2001 |
| Property Formula Limited | Professional & scientific | 2011 |
| Property Funds Research Ltd | Other services | 2006 |
| Property Owners Limited | Financial services | 1962 |
| Property Park Development Ltd | Households | 2018 |
| Property Web Solutions Limited | Wholesale & retail | 2008 |
| Propest Oxford Ltd | Administrative & support | 2022 |
| Prophase Development Limited | Professional & scientific | 2004 |
| Propond Ltd | Real estate | 2025 |
| Propresso.Co.Uk Ltd | Manufacturing | 2022 |
| Proready Limited | Information & communication | 2025 |
| Prospect Peace Limited | Professional & scientific | 2017 |
| Prospect Personnel Solutions Ltd | Administrative & support | 2010 |
| Prosper Business Services Ltd | Professional & scientific | 2026 |
| Prosper Sports Limited | Information & communication | 2024 |
| Protectix Limited | Administrative & support | 2024 |
| Protectorate Ltd | Administrative & support | 1996 |
| Proton Fusion Limited | Information & communication | 2020 |
| Protronics Limited | Information & communication | 1996 |
| Provek Holdings Limited | Professional & scientific | 2013 |
| Provek Limited | Administrative & support | 1994 |
| Provestment Limited | Real estate | 2016 |
| Providentia Analytics Ltd | Information & communication | 2004 |
| Provincial Equity Finance Limited | Financial services | 2000 |
| Proxisense Limited | Manufacturing | 2014 |
| Proying Ltd | Wholesale & retail | 2025 |
| PS Oxford Limited | Wholesale & retail | 2015 |
| Psalter Optics Limited | Professional & scientific | 2020 |
| PSDB03 Ltd | Professional & scientific | 2021 |
| Pseudonymz Ltd | Professional & scientific | 2004 |
| PSN Holdings (SW) Ltd | Real estate | 2015 |
| Psshlps NO 2 Limited | Professional & scientific | 2012 |
| Psyberfunk Music Ltd. | Wholesale & retail | 2022 |
| Psycha Health Ltd | Health & social care | 2024 |
| Psychometric, Evaluation & Assessment Services Ltd | Professional & scientific | 2022 |
| Psychotic Micromanagement Limited | Information & communication | 2020 |
| Psypher AI UK Limited | Information & communication | 2025 |
| PT Nepa Limited | Hospitality | 2025 |
| PT United Limited | Health & social care | 2018 |
| Ptox Ltd | Arts & recreation | 2021 |
| Public Image Group Limited | Information & communication | 2013 |
| Publicisejesus Limited | Information & communication | 2009 |
| Pudding House Ltd | Hospitality | 2025 |
| Pues Nada Limited | Professional & scientific | 2013 |
| Pulse African Restaurant Ltd | Hospitality | 2022 |
| Pump Parts Limited | Manufacturing | 1999 |
| Punchroom Limited | Arts & recreation | 2024 |
| Pundit Ltd | Information & communication | 2023 |
| Punjab Sweets & Snacks Ltd | Wholesale & retail | 2023 |
| Pure Business Limited | Professional & scientific | 2005 |
| Pure Capture Innovations Ltd | Manufacturing | 2025 |
| Pure Care Recruitment Limited | Administrative & support | 2022 |
| Pure Chemistry Lingerie Ltd | Wholesale & retail | 2010 |
| Pure Essentials Ltd | Wholesale & retail | 2010 |
| Pure Sports Management Limited | Administrative & support | 2002 |
| Pure Work Spaces Ltd | Administrative & support | 2026 |
| Purebite Foods Ltd | Wholesale & retail | 2025 |
| Purlieu Ltd | Wholesale & retail | 2023 |
| Purple Atoll Limited | Real estate | 2024 |
| Purpose Improvement Ltd | Wholesale & retail | 2024 |
| Putt Property Holdings Limited | Real estate | 1994 |
| Puttistudio Ltd | Professional & scientific | 2025 |
| Puzzle Media Limited | Wholesale & retail | 2019 |
| PV Finance Limited | Financial services | 2020 |
| PV Holdco Limited | Financial services | 2020 |
| PV Midco Limited | Financial services | 2020 |
| PWJ Digital Limited | Information & communication | 2018 |
| PX Innovation Consulting Ltd | Professional & scientific | 2018 |
| PY Game Ltd | Information & communication | 2025 |
| Pycode Ltd | Information & communication | 2025 |
| Pyper Consultancy Limited | Health & social care | 2009 |
| PYR Partners Ltd | Professional & scientific | 2024 |